On the other hand, the authors of [1]} managed to obtain the central charge for a class of near horizon spacetime and vector field solutions in Einstein-Maxwell theory by using the asymptotic symmetry group (ASG) method. This work was reviewed and then generalized to a class of gravitational theories in [2]}. Interestingly, the near horizon metric (REF ) and vector field (REF ) fall into the category discussed in [1]}. Therefore, the ASG method to obtain the corresponding central charge derived in [1]} should apply to the case of MRNTN black hole studied in this paper.
